CN102916603A - Single-phase unsymmetrical multi-level inverter with pre-charging circuit and charging method of single-phase unsymmetrical multi-level inverter - Google Patents
Single-phase unsymmetrical multi-level inverter with pre-charging circuit and charging method of single-phase unsymmetrical multi-level inverter Download PDFInfo
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- CN102916603A CN102916603A CN2012104141705A CN201210414170A CN102916603A CN 102916603 A CN102916603 A CN 102916603A CN 2012104141705 A CN2012104141705 A CN 2012104141705A CN 201210414170 A CN201210414170 A CN 201210414170A CN 102916603 A CN102916603 A CN 102916603A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4837—Flying capacitor converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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Abstract
The invention relates to a single-phase unsymmetrical multi-level inverter with a pre-charging circuit and a charging method of the single-phase unsymmetrical multi-level inverter, belonging to the field of electric energy conversion. The single-phase unsymmetrical multi-level inverter is used for converting direct current to alternating current. The single-phase unsymmetrical multi-level inverter comprises a switch, a charging resistor, ten power switch elements and three capacitors, wherein the selector switch is connected in parallel with the charging resistor and then connected in series between a direct current input power source and the direct current anode of the single-phase unsymmetrical multi-level inverter. At the initial moment of electrifying, the selector switch is cut off, the direct current input power source charges the two serial capacitors at a direct current input end through the charging resistor; after the two serial capacitors are charged, the voltage of a suspension capacitor is acquired, and the two power switch elements which are used for connecting the suspension capacitor and an anode busbar of the inverter are conducted with the two power switch elements which are used for connecting the suspension capacitor and the cathode busbar of the inverter; and when the voltage of the suspension capacitor is equal to 1/4 of the voltage of a direct current power source, the conducted power switch elements are cut off, and the selector switch is closed. The single-phase unsymmetrical multi-level inverter has the advantages of compact structure, low cost, easiness for implementation, high efficiency, high reliability and the like.
Description
Technical field
The present invention relates to a kind of single-phase asymmetric multi-electrical level inverter and charging method thereof that comprises pre-charge circuit, belong to the transformation of electrical energy field, be used for direct voltage is converted to alternating voltage.
Background technology
Many level power converter technique is compared with two level DCs-exchange conversion technology by direct voltage being converted to plurality of level and then realizing that direct current arrives the conversion that exchanges, and has lower voltage change ratio stress and less voltage harmonic content.Along with the maturation application of full-controlled switch device and the appearance of the novel full-control type devices such as IECT, IGCT, and with DSP, FPGA popularizing with the high-performance digital control technology of core, research and the application of multi-electrical level inverter have obtained fast development, have in recent years become study hotspot.
According to the topological structure of main circuit, multi-electrical level inverter can be divided into diode clamp, striding capacitance clamper and unit cascaded three classes at present.Unit cascaded type multi-electrical level inverter can be by adopting the low voltage grade the method for power switching device series realize the output of mesohigh; Each power cell can adopt lower switching frequency, and the equivalent switching frequency after the series connection can obtain into the raising of multiple, can greatly reduce switching loss, reduction and output harmonic wave content.Diode clamping type multi-electrical level inverter is limited in some specific level by diode with output voltage, and then realizes many level outputs.And the form that striding capacitance clamper multi-electrical level inverter adopts a plurality of electric capacity to suspend by controlling the voltage of each striding capacitance, and then need not a plurality of diodes for clamping, just can realize that voltage with multiple levels exports.
Multi-electrical level inverter is obtaining low voltage rate of change stress, in the time of lower voltage harmonic content, because switching device and the energy storage device quantity of its use are more, cause its cost higher on the one hand, volume is larger, cause on the other hand the total losses of power device obviously to improve, system effectiveness descends obviously, also brings larger difficulty for system radiating simultaneously.Need research and development when obtaining many level output voltage, can use still less many level power converter technique of power device, to reduce system bulk and cost, improve system effectiveness, realize the efficient power-saving operation of system.
Summary of the invention
The object of the present invention is to provide a kind of single-phase asymmetric multi-electrical level inverter and charging method thereof that comprises pre-charge circuit, comprise the charging problem of flying capacitor of initial power up of the asymmetric multi-electrical level inverter of flying capacitor with solution.
A kind of single-phase asymmetric multi-electrical level inverter that comprises pre-charge circuit, its composition comprises capacitor C 1(1), capacitor C 2(2), power switch pipe V1(3), power switch pipe V2(4), power switch pipe V3(5), power switch pipe V4(6), power switch pipe V5(7), power switch pipe V7(8), power switch pipe V8(9), power switch pipe V6(10), capacitor C 3(11), power switch pipe V9(12), power switch pipe V10(13), K switch 1(14), charging resistor R1(15), direct voltage testing circuit (16), controller (17), isolated drive circuit (18);
Described capacitor C 1(1) a end and capacitor C 2(2) an end, V2(4) power take-off and V3(5) the power input link to each other, the negative pole of the DC power supply of the other end C2(2) and outside input, V4(6) power take-off and V10(13) power take-off link to each other, V1(3) power take-off and V2(4) power input and V5(7) the power input link to each other, V3(5) power take-off and V4(6) power input and V8(9) power take-off link to each other, V5(7) power take-off and capacitor C 3(11) an end and V7(8) the power input link to each other, V6(10) power input and capacitor C 3(11) the other end and V8(9) power take-off links to each other, V7(8) power take-off and V8(9) the power input link to each other, and as a port of alternating voltage output, V9(12) power take-off and V10(13) the power input link to each other, and as another port of alternating voltage output; K switch 1(14) a end and charging resistor R1(15) an end and the positive pole of the DC power supply of outside input link to each other, K switch 1(14) a end and charging resistor R1(15) the other end and capacitor C 1(1) the other end, V1(3) power input and V9(12) the power input link to each other;
Direct voltage testing circuit (16) is for detection of direct-current input power supplying, capacitor C 1(1), capacitor C 2(2) and capacitor C 3(11) voltage, the output of direct voltage testing circuit (16) links to each other with the input of controller (17), the output of controller (17) links to each other with the input of isolated drive circuit (18), the output of isolated drive circuit (18) respectively with K switch 1(14) control end, power switch pipe V1(3) control signal input, power switch pipe V5(7) control signal input, power switch pipe V4(6) control signal input and power switch pipe V6(10) the control signal input link to each other.
The control step of charging method that comprises the single-phase asymmetric multi-electrical level inverter of pre-charge circuit is:
One, when initially powering on, K switch 1(14) disconnects, detect respectively direct-current input power supplying, capacitor C 1(1 by direct voltage testing circuit (16)), capacitor C 2(2) and capacitor C 3(11) voltage, and be converted into and detect low voltage signal and be input in the controller (17);
Two, in controller (17), with capacitor C 1(1) voltage and capacitor C 2(2) the voltage addition, the voltage that obtains and subtract each other with direct-current input power supplying voltage, when described voltage with when differing less than less difference with the difference of direct-current input power supplying voltage, capacitor C 1(1 is described) and capacitor C 2(2) charged complete, execution in step three;
Three, make power switch pipe V1(3), power switch pipe V5(7), power switch pipe V4(6) and power switch pipe V6(10) conducting, capacitor C 3(11) begins charging, at capacitor C 3(11) voltage be 1/4 o'clock of direct-current input power supplying voltage, switch-off power switching tube V1(3), power switch pipe V5(7), power switch pipe V4(6) and power switch pipe V6(10), with seasonal K switch 1(14) closure, with charging resistor R1(15) short circuit, so far charging process finishes.
The advantage that the present invention has: (1) is under the prerequisite of the output voltage waveforms that obtains the same level number, the present invention is owing to adopt new asymmetric multi-electrical level inverter topology, need not the clamp diode in the diode-clamped multi-electrical level inverter in the existing scheme, flying capacitor type multi-electrical level inverter in the existing scheme, the quantity of storage capacitor and device for power switching all decreases; (2) only need in multi-electrical level inverter, to add charging resistor and short switch, existing device for power switching is realized the precharge control to two series capacitances and a flying capacitor in the inverters, need not additionally increases charge power supply or pre-charge circuit, thus the present invention has compact conformation, cost is lower and efficient than advantages of higher.
Description of drawings
Fig. 1 is schematic diagram of the present invention;
Fig. 2 is that inverter output voltage is 0 equivalent electric circuit;
Fig. 3 is that inverter output voltage is 1/4 equivalent electric circuit;
Fig. 4 is that inverter output voltage is 1/2 equivalent electric circuit;
Fig. 5 is that inverter output voltage is 3/4 equivalent electric circuit;
Fig. 6 is that inverter output voltage is 1 equivalent electric circuit;
Fig. 7 is the flow chart of charging method of the present invention;
Fig. 8 is of the present invention for capacitor C 1(1), capacitor C 2(2) the equivalent circuit theory figure of charging process;
Fig. 9 is of the present invention for capacitor C 3(11) the equivalent circuit theory figure of charging process.
Embodiment
Embodiment one:Specify present embodiment below in conjunction with Fig. 1 to Fig. 6.Fig. 1 is the schematic diagram that comprises single-phase asymmetric nine electrical level inverters of pre-charge circuit, a kind of single-phase asymmetric multi-electrical level inverter that comprises pre-charge circuit, its composition comprises capacitor C 1(1), capacitor C 2(2), power switch pipe V1(3), power switch pipe V2(4), power switch pipe V3(5), power switch pipe V4(6), power switch pipe V5(7), power switch pipe V7(8), power switch pipe V8(9), power switch pipe V6(10), capacitor C 3(11), power switch pipe V9(12), power switch pipe V10(13), K switch 1(14), charging resistor R1(15), direct voltage testing circuit (16), controller (17), isolated drive circuit (18);
Described capacitor C 1(1) a end and capacitor C 2(2) an end, V2(4) power take-off and V3(5) the power input link to each other, the negative pole of the DC power supply of the other end C2(2) and outside input, V4(6) power take-off and V10(13) power take-off link to each other, V1(3) power take-off and V2(4) power input and V5(7) the power input link to each other, V3(5) power take-off and V4(6) power input and V8(9) power take-off link to each other, V5(7) power take-off and capacitor C 3(11) an end and V7(8) the power input link to each other, V6(10) power input and capacitor C 3(11) the other end and V8(9) power take-off links to each other, V7(8) power take-off and V8(9) the power input link to each other, and as a port of alternating voltage output, V9(12) power take-off and V10(13) the power input link to each other, and as another port of alternating voltage output; K switch 1(14) a end and charging resistor R1(15) an end and the positive pole of the DC power supply of outside input link to each other, K switch 1(14) a end and charging resistor R1(15) the other end and capacitor C 1(1) the other end, V1(3) power input and V9(12) the power input link to each other;
Direct voltage testing circuit (16) is for detection of direct-current input power supplying, capacitor C 1(1), capacitor C 2(2) and capacitor C 3(11) voltage, the output of direct voltage testing circuit (16) links to each other with the input of controller (17), the output of controller (17) links to each other with the input of isolated drive circuit (18), the output of isolated drive circuit (18) respectively with K switch 1(14) control end, power switch pipe V1(3) control signal input, power switch pipe V5(7) control signal input, power switch pipe V4(6) control signal input and power switch pipe V6(10) the control signal input link to each other.
The operation principle of the below's concrete analysis single-phase asymmetric nine electrical level inverters of the present invention.At first analyze V9 and turn-off the situation of V10 conducting.The direct voltage of supposing input is 1, because the capacitor C 1 of input and C2 series connection, and the appearance value equates that then the magnitude of voltage of two electric capacity is 1/2, voltage by capacitor C 3 is 1/4 again, then at power device V4, V6, V8, during the V10 conducting, its output voltage is 0, and its equivalent electric circuit as shown in Figure 2.At V4, V6, V7, during the V10 conducting, its output voltage is 1/4, its equivalent electric circuit is as shown in Figure 3.At V3, V6, V8, during the V10 conducting, its output voltage is 1/2, its equivalent electric circuit is as shown in Figure 4.At V1, V5, V8, during the V10 conducting, its output voltage is 3/4, its equivalent electric circuit is as shown in Figure 5.At V1, V5, V7, during the V10 conducting, its output voltage is 1, its equivalent electric circuit is as shown in Figure 6.By that analogy, in the V9 conducting, when V10 turn-offed, inverter was output as four kinds of negative level, has 9 kinds of output voltages, and the power device of corresponding conducting is listed in table 1.
The power device tabulation that each output level of table 1 is corresponding
| Numbering | Output level | The power device of conducting |
| 1 | 1 | V1，V5，V7，V10 |
| 2 | 3/4 | V1，V5，V8，V10 |
| 3 | 1/2 | V3，V6，V8，V10 |
| 4 | 1/4 | V4，V6，V7，V10 |
| 5 | 0 | V4，V6，V8，V10 |
| 6 | -1/4 | V1，V5，V8，V9 |
| 7 | -1/2 | V2，V5，V7，V9 |
| 8 | -3/4 | V4，V6，V7，V9 |
| 9 | -1 | V4，V6，V8，V9 |
As the above analysis, by corresponding power device is controlled, can realize direct voltage is converted to many level output voltage.
And when initially powering on, relate to the precharge problem of three electric capacity that comprise in the inverter, if directly link to each other with DC power supply, then because the characteristic of the instantaneous short circuit of electric capacity, cause moment excessive from the charging circuit that DC power supply extracts, cause easily the damage of DC power supply.In addition, why the inverter among the present invention can export the voltage waveform of nine level, is 1/4 of direct-current input power supplying voltage just because of the voltage of flying capacitor, therefore need to when initially powering on its voltage be charged to 1/4 of direct-current input power supplying voltage.
Therefore tandem tap K1(14 between the electrode input end of DC power supply and inverter) and charging resistor R1(15), K switch 1(14) and charging resistor R1(15) parallel connection, when initially powering on, be three capacitor chargings by charging resistor, after charging is finished by K switch 1(14) with charging resistor R1(15) short circuit, avoid causing meaningless loss.
Embodiment two:Specify present embodiment below in conjunction with Fig. 7 to Fig. 9.Comprise pre-charge circuit single-phase asymmetric multi-electrical level inverter charging method flow chart as shown in Figure 7, its control step be:
One, when initially powering on, K switch 1(14) disconnects, detect respectively direct-current input power supplying, capacitor C 1(1 by direct voltage testing circuit (16)), capacitor C 2(2) and capacitor C 3(11) voltage, and be converted into and detect low voltage signal and be input in the controller (17);
Two, in controller (17), with capacitor C 1(1) voltage and capacitor C 2(2) the voltage addition, the voltage that obtains and subtract each other with direct-current input power supplying voltage, when described voltage with when differing less than less difference with the difference of direct-current input power supplying voltage, capacitor C 1(1 is described) and capacitor C 2(2) charged complete, execution in step three;
Three, make power switch pipe V1(3), power switch pipe V5(7), power switch pipe V4(6) and power switch pipe V6(10) conducting, capacitor C 3(11) begins charging, at capacitor C 3(11) voltage be 1/4 o'clock of direct-current input power supplying voltage, switch-off power switching tube V1(3), power switch pipe V5(7), power switch pipe V4(6) and power switch pipe V6(10), with seasonal K switch 1(14) closure, with charging resistor R1(15) short circuit.
When initially powering on, by charging resistor R1(15) be capacitor C 1(1) and capacitor C 2(2) charging, the equivalent electric circuit of inverter is as shown in Figure 8.At capacitor C 1(1) and capacitor C 2(2) charging finish after, the voltage of the two should be arranged and equal DC power supply voltage, next be capacitor C 3(11) charging, with power switch pipe V5(7), power switch pipe V4(6) and power switch pipe V6(10), with seasonal K switch 1(14) closure, so that with capacitor C 3(11) connect with DC power supply, utilize charging resistor R1(15) carry out the restriction of charging current, and given charging voltage is 1/4 DC power supply voltage, and the equivalent electric circuit of inverter as shown in Figure 9.At capacitor C 3(11) voltage be 1/4 o'clock of direct-current input power supplying voltage, switch-off power switching tube V1(3), power switch pipe V5(7), power switch pipe V4(6) and power switch pipe V6(10), with seasonal K switch 1(14) closure, with charging resistor R1(15) short circuit, so far charging process finishes.
Claims (2)
1. single-phase asymmetric multi-electrical level inverter that comprises pre-charge circuit, it is characterized in that its composition comprises capacitor C 1(1), capacitor C 2(2), power switch pipe V1(3), power switch pipe V2(4), power switch pipe V3(5), power switch pipe V4(6), power switch pipe V5(7), power switch pipe V7(8), power switch pipe V8(9), power switch pipe V6(10), capacitor C 3(11), power switch pipe V9(12), power switch pipe V10(13), K switch 1(14), charging resistor R1(15), direct voltage testing circuit (16), controller (17), isolated drive circuit (18);
Described capacitor C 1(1) a end and capacitor C 2(2) an end, V2(4) power take-off and V3(5) the power input link to each other, the negative pole of the DC power supply of the other end C2(2) and outside input, V4(6) power take-off and V10(13) power take-off link to each other, V1(3) power take-off and V2(4) power input and V5(7) the power input link to each other, V3(5) power take-off and V4(6) power input and V8(9) power take-off link to each other, V5(7) power take-off and capacitor C 3(11) an end and V7(8) the power input link to each other, V6(10) power input and capacitor C 3(11) the other end and V8(9) power take-off links to each other, V7(8) power take-off and V8(9) the power input link to each other, and as a port of alternating voltage output, V9(12) power take-off and V10(13) the power input link to each other, and as another port of alternating voltage output; K switch 1(14) a end and charging resistor R1(15) an end and the positive pole of the DC power supply of outside input link to each other, K switch 1(14) a end and charging resistor R1(15) the other end and capacitor C 1(1) the other end, V1(3) power input and V9(12) the power input link to each other;
Direct voltage testing circuit (16) is for detection of direct-current input power supplying, capacitor C 1(1), capacitor C 2(2) and capacitor C 3(11) voltage, the output of direct voltage testing circuit (16) links to each other with the input of controller (17), the output of controller (17) links to each other with the input of isolated drive circuit (18), the output of isolated drive circuit (18) respectively with K switch 1(14) control end, power switch pipe V1(3) control signal input, power switch pipe V5(7) control signal input, power switch pipe V4(6) control signal input and power switch pipe V6(10) the control signal input link to each other.
2. the charging method that comprises the single-phase asymmetric multi-electrical level inverter of pre-charge circuit according to claim 1 is characterized in that, its control step is:
One, when initially powering on, K switch 1(14) disconnects, detect respectively direct-current input power supplying, capacitor C 1(1 by direct voltage testing circuit (16)), capacitor C 2(2) and capacitor C 3(11) voltage, and be converted into and detect low voltage signal and be input in the controller (17);
Two, in controller (17), with capacitor C 1(1) voltage and capacitor C 2(2) the voltage addition, the voltage that obtains and subtract each other with direct-current input power supplying voltage, when described voltage with when differing less than less difference with the difference of direct-current input power supplying voltage, capacitor C 1(1 is described) and capacitor C 2(2) charged complete, execution in step three;
Three, make power switch pipe V1(3), power switch pipe V5(7), power switch pipe V4(6) and power switch pipe V6(10) conducting, capacitor C 3(11) begins charging, at capacitor C 3(11) voltage be 1/4 o'clock of direct-current input power supplying voltage, switch-off power switching tube V1(3), power switch pipe V5(7), power switch pipe V4(6) and power switch pipe V6(10), with seasonal K switch 1(14) closure, with charging resistor R1(15) short circuit, so far charging process finishes.
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Application publication date: 20130206 |